The guys at www.roamdrive.com have released beta 2 of RoamDrive.
RoamDrive allows users to store files using the free space available on their web-based e-mail accounts. RoamDrive Beta 2 now supports not just Hotmail, but MSN and Gmail as well. Beta 2 appears to have a lot of bug fixes and improvements over their previous beta 1 release.
According to their website they plan on releasing a Pro version that supports Yahoo and can link multiple accounts together for an almost unlimited amount of storage. I got my copy by just running beta 1 and it automatically updated itself, or you can download it from their website.